Improvement in stump-extractors



A M. PHOTU-LITHO. CO. N. Y. (OSBORN E'S PROCESS) UNITED STATESPATENTXOFFICE.

THOMAS CRANE, OF FORT ATKINSON,`WISGONS1N.

IM PROVEM ENT IN STU M P-EXTRACTORS.

To all 'whom t may concern.-

Beit known that I, THoMAs CRANE, ot' Fort Atkinson, in the county of Jeierson and State of Wisconsin, have invented a new and ImprovedStump-Extractor; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, making a part of this specitication, in which-Figure l is a plan view of my improved machine. Fig.2 is a verticallongitudinal section taken centrally through the machine.

Similar letters ot' reference indicate corresponding parts in bothiigures.

This invention relates to a novel machine for extracting stumps of treesand large stones from the ground for the purpose of clearing land whichit is desired to put under cultivation.

It consists in a machine which is so constructed that the power ot ateam, acting through the medium of a large pulley and windlass, isapplied to lift one of the legs of a tripod, to the other two ot` whichthe weight to be raised is attached, thus combining two of thewell-known mechanical powers in a most convenient and advantageousmanner, las will be hereinafter described.

To enable others skilled in the art to understand my invention, I willdescribe its construction and operation.

'In the accompanying drawings, A A represent two sill-beams, which arefirmly united together so as to form two sides ot' a triangle, and thusgive a wide base or support for the parts which are employed to extractthe stumps. By thus uniting the sill-bearns they will admit ofa stumpbetween them, as indicated in Fig. 2. To the forward ends ot' these twobeams two beams, B B, are securely framed, which are also converging,and which are supported in inclined positions by means ofan inclinedpiece of timber, C, as shown in Figs. l and 2.

The upper ends ofthe beams B B are adapted for serving as bearings for ahorizontal transverse shaft or windlass, D, which carries on one end alarge pulley, E, which has an annular groove in its periphery forreceiving a rope or chain, a, that is wound upon this pulley andsuitably secured to it. The rope or chain a is carried off from thelower side of said pulley and passed through an eye, b, which keeps therope in proper position during the operation of the machine.

A rope or chain, c, is attached at both ends tothe shaft D and receivesthe lower notched end of an inclined lifting-bar, F, which extendsupward over the shaft D to a suitable height, and is attached to theupper united ends of two beams, G G, as shown iu Figs. l and 2, so as toform a kind ot' joint. The lower ends ot' the two beams G G aresupported upon the ends of the sill-beams A A, and are kept in placethereon by means ot'stop-blocks tta, which not only prevent the beams GGfrom slipping backward, but also prevent them from spreading apart.

The three beams G G and F form a tripod when put together and erected inthe position shown in Figs. l and 2, and to the crotch of the two unitedbeams G G a rope or chain, g, is attached, the lower end of which issuitably secured to the stump or stone which it is desired to extract,so that when power is applied to the bar F to lift the upper ends ofthebeams G G both ot' these beams will mutually sustain the load to belifted.

The operation ot my machine is as follows: The team is hitched to thepulley-rope a, the machine being properly adjusted over a stump,

as shown in Fig. 2, and the tripod erected over it. The lower end of thelifting-beam is seated upon the rope or chain c and the rope or chain gattached to the stump. The team is y now moved ott'so as to turn thepulleyE, which rotates the shaft D and winds the rope or chain C upon itslowly, thus lifting the beam F and raising the upper ends of the beamsG G.

lt will be seen from the above description that the strain upon thethree lifting-beams G G and F is nearly in a line with their length;that upon the beam F is exactly so; hence these timbers can be made verylight and yet possess a sufficient amount ot' strength.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination ot' the tripod lit'ting-t'i'aine G G F, triangularbase A, and windlass D, operating substantially as described.

2. Sustaining the lower end ot' the liftingbeam F upon a rope or chain,c, of the windlass D, substantially as described.

3. The combination ot' the pulley E, drat'trope a, windlass D,stirrup-chain O, and the lifting-beam F of the tripod, substantially asdescribed.

THOMAS CRANE. Witnesses:

' EDWARD H. RANKIN,

H. A. PORTER.

